Tool post assembly for machine tools



Feb. 3, 1948. R. L. DORN 35,

TOOL POST ASSEMBLY FOR MACHINE TOOLS Filed 001. 10, 1944 I 2Sheets-:Sheet 1 40 l 2 INVENTOR Ro Lfio/a/v ATTORNEY Feb. 3, 1948. R.1.. DORN TOOL POST AS Filed Oct. 10, 1944 SEMBLY FOR MACHINE TOOLS 2Sheets-Sheet 2 5 lNVENTOR Roy L. floR/v T1315. T1117. 7 I I I ATTORNEYPatented Feb. 3, 1948 UNITED STATES PATENT OFFICE TOQL POST AS'SEIVIBLYFOR TOOLS 7 Roy L. Dorn, Riverdale, Calif. Application October 10, 1944,SeriaNo*. "-58,06 4 Claims. (01. 82--37-) My invention relates to anadjustable post for a lathe, a shaper, and similar tools, the post beingadapted to support the cutting tool holder.

Theobject I have accomplished is the construction: of a post forholding, or supporting the cutting tool holder used on a lathe, ashaper, or other similar tools wherein the adjustment of the height,angle of cutting, or rake of the tool can easily be adjusted.

These, and other objects hereinafter referred to are accomplished bymeans of the device herein described and illustrated on the accompanyingdrawing in which Fig. l is a view of the T-slot member on the compoundrest of the lathe, the T-slot being adapted to hold the adjustable toolpost.

Fig. 2 is an enlarged view of a block having, a concave face adapted tocooperate with the convex base of the post, and having a holetherethrough adapted to fit over, and around the post.

Fig. 3 is a fractional view of the tool post having an approximatelyellipsoid base,. the top face ofsaid base being adapted to fit withinthe concavity in the face of the block shown in Fig. 2.

Fig. 4 is a view of the tool post and its base, having parts cut away tobetter show the form of the base in section, and having the block shownin Fig. 2. assembled therewith, said block also being. shown in section.

Fig. 5 is a face view of shown in Fig. 6.

Fig. 6' shows three cooperating discsassembled, but slightly spacedapart to emphasize the fact that each disc is independent of the others.

Fig. 7 is a separate view of the center disc shown in Fig. 6, showingthe center hub, or core which is constructed integral with the centerdisc; portions thereof being cut away to show the interior design of thehub.

Fig. 8 is a cross sectional view of the disc assembly shown in Fig. 6along sectional line 8-8 in Fig. 6.

9 is an enlarged tool post having a modified form ofbase, and hasassembled therewith the. tool holder and adjusting discs.

Fig. 10 is a tool post similar to the one shown in Fig. 9; the Viewbeing at right angles to the view shown in Fig. 9.

Fig. 11 is a tool holder adapted to fit into the slot in the tool post.

Fig. 12 shows the top face of the top disc, being a concave surface.

Fig. 13 is a rocker block, the curved bottom being adapted to fit withinthe concave surface of-the disc'shown in Fig. 12.

Fig. 14.- is a modified form of the face of the disc; inclines being.substituted for threads. the inclines being. spiral and rising in aclockwise direction.

either of the discs Fig. 15 is: similar in all respects to Fig. 14 except the spiral of the inclines thereon describe an. anti-clockwisedirection- Fig. 1-6 is a block. adapted. with cooperating blocks to varythe tool post in a leaning position.

Fig- 1'7 is another block to* be used with. the base of the tool post,and other blocks; to varythe vertical angle of the tool post.

Referring to the drawing, I have shown in Fig. 1 a tool post support 20:hav'ng a I -slot 2|, which slot. 21. runs lengthwise within. said: toolpost: support 2.0. T-slot 21' is adapted-v toreceive and. hold toolpost30. Tool post 39' has an; approximately ellipsoid. base 371i attachedthereto as shown in. Figs. 3 and 4.. Block 34, shown in Fig. 2',.asectional view thereof being; shown: in Fig. i, can be" assembled withtool post 3-05: by placing, block 34 over tool post. 3!! andthroughhole35 in blockv 34=, the concave face 36 of said; block being adjacent tothe upper surface of the ellipsoid. base 31; of tool. post 30. Assembledbase 31 and block 34. should be of such size that: they can. easilyenter and slide within 'F-slot 2l=. Tool holder 19 shown inFiga ll can.be inserted in slot t8. after positioning, di'scs lit. 42 and 43 shownin' Figs; 6? and 8;. and in' Fig. 9 between tool post: support 20andtool. holder i8 Rocker block 4:9 ,.shown in- Figs. 9- and 13, isinserted within slot is: under tool holder is with the curved. surfacethereof adjacent. to the concave face of disc 41:, this. arrangementbeing, adapted to adjust the angle of the tool holder by moving rockerblock is so that the plane ofv its upper surfaceis' at the selectedangle with ahorizontal line. Them by tightening set; screw 24- shown. inFig. 9, that is by screwing it down firmly on! the top of the toolresting on rocker block 49,, the tool holder. the adjusting discs, andthe tool post are all tightly clamped to tool support 20, and tothecompound rest of. the" lathe, not shown in the drawing, to which tool.support 20: is attached'.

It is; noted that in tool posts and assemblies now in use the rockerblock as described is in use and it permits the tool: holder to betilted on one plane only, but the. post is, constantly rigid in a:vertical position. In my invention I have provided for the leaning ofthe toolin any direction desired; and have provided the following.elements to accomplish that result. Under face 39 of base 31' is convexto enable post 30 to be leaned in any direction. Upper face 38 of base3-1 is likewise convex for the same purpose. To hold post 39 firmlywhen. the selected positionor leaning of the post is attained, I- haveprovided block 34 which has a concave face 36;. Concave face 36' fitsover convex surface 38 of base 331. It will be noted that face 36A,being the; upper face of block 34, is a: plane which can rest againstthe plane: under. surface of flanges 263A forming T slot 2!, and anydirection post 30 may lean the convex surface 38 of base 31 engages theconcave surface 36 of block 34 and will make a firm contact with toolpost support 29. Hole 35 in block 34 is large enough so that block 34will not interfere with the leaning position of the post withinreasonable limits.

Hole 46 in hub 45 describes two frustums of frustums forming hole 46.When disc 43 is as sembled with tool post 33 by passing the tool used'totilt post 30 in the direction desired. Base post through hole 46, suchhub 45 will not interfere with the leaning of tool post 30. Hub 45 has auniform outside diameter and is adapted for discs 4! and 42 to bethreaded thereon, so that discs 4!, 42 and itare concentric with eachother.

Members 4!, 42 and 43 are adjusting discs. Discs 4! and '32 have facesnot on parallel planes but are approximately wedge shaped. Each of discs4i and 42 have center holes 45 therein which will encircle hub 45. It isnoted that when discs 4| and 42 are assembled with disc 43 between them,discs 4! and 42 can be rotated in the same or in opposite directions onhub 35. The

is partially filled with rocker t9, and discs ii; If additional space isstill unoccupied, not required for adjustments, it can be filled in withwashers 7 48. However in practice such needed. It is noted when suchspace between the tool holder and the support for the tool post ispracticaly filled, by moving discs 4i and 62 relative to each other, theangle of the plane on which too] holder 19 rests can be angledin anyselected position. When the angle desired has been secured, minuteadjustments as to the heightof the tool holder is made as follows:Adjacent faces of discs ll, t2 and 43 have scroll threads 40 thereon,which in one position will fit together, but when rotated independently,the threads will ride on the top of each other. leaningadjustantidockwise instead of clockwise, These in-- clines aredesignated 46W; 46X, 40! and 4532. When discs ll and 42 havingthesemodified faces are assembled with the spiral'inclined facesadjacent, and concentric with each other it will be noted that byrotating either disc without a corresponding rotation of the other, willmove the discs slightly apart or together, depending on the directionthe discs are rotated, and this action is adapted to make slightadjustments in the height of the tool holder from the-base,.or. toolpost support. In use discs 2 and d3, heretofore d'escribed.- It

each disc in Figs. 14 and '15,

block 6|. 7 r" recess 62A and openingBED' The assembled post Havingdescribedmy invention, I claim as new 43K and 433? are substitutedhaveshown four of these i can be greater or less with assembled restsagainst the under faces 7 can easily pass therethrough. V 7

base '31A is attached this combination post direction. Discs ii, 42

31A has a lateral, and a transverse cylindrical convexsurface on theunderside of the base instead of the spherical convex surface shown in.Figsz 2, 3 and. The longitudinal center lines of those convex surfacesare at right angles. Upper surface 38A of base 31A is likewise acylindrical convex surface the center line thereof being parallel to thecenter line of one of the cylindrical convex'surfaces 393. On the top ofbase 31A is fitted a block 6!, having a cylindrical concave surface 61A,the curve of which neatly fits on the upper surface 38A of thereon. Theupper face of block 6| consists of two portions extendinglengthwise ofthe block, said portions being designated 65B and ME, the surfaces ofsaid portions 8 l B and ME being curved with the diameter of the curveat right angles to the diameter of the under concave surface 61A.

Parallel with the lineal diameter of under face EiA and firmly attachedto the upper face of' 62D. Block 62 is adapted tobe assembled with block6|, the concave face of block 62 resting on the convex face of block 6!and to slide thereon. Upper face 6200f block 62 is a. plane which, whenof flanges The rectangular opensuch size that post 3% 20A on postsupport 29. ing 62D in block 62 is of p In operating this device tothelower end of post 39; block 6| is threaded on post 30 so that'thecylindrical concave surface 1 ages the'convex cylindrical surface" ofblock 6i eng of base 37A. Block 62 is then threaded on post 35 so thatits under cylindrical concave surface 623 to the upper convex surface61B of C shouid engage is adjacent Rectangular guide 6| 3%, base 31A,and blocks SI and 62 are then inserted in slideway' 2 I. It will benoted that'with and 43 are then threaded over post 30, and'washers'48are positioned between disc 42 and flanges 20 if necessary. we Rocker 49is insertedin slot i8, and tool I9 is'likewise placed in slot [8, andwhenpost 30 is positioned r at the desired angle cap screw 24 istightened on' a cutting tool is; The cutting tool is thus held rigid inthe selected position.

and ask for Letters Patent:

1 In a tool base 37A, so it can slide 30 can be rocked in any device of"the characterdescribed, a V

curved to neatly fit the upper surface of the base and adapted to slidethereon;

first independent block being diameter of the curve at right angles tothe diameter of the under curve of the first independent block, arectangular key eX- tending across the upper face of the firstindependent block at right angles to the diameter of the curve of theupper face of the first independent block; a second independent blockapproximately rectangular in form having a curved surface on the underface adapted to fit on to, and to slide on the upper pendent block, anda key way on the under side of the second independent block adapted whenassembled with the first independent block to receive the key on thefirst independent block, holes through the first independent block andthe second independent block adapted for the tool post to loosely passtherethrough, the device having a tool post support the support havtoolpost base, the second independent block when assembled together to passwithin said inverted, T-slot, the assembled base, the first independentblock and the second independent block when Within the slot beingadapted to permit the post to lean within a limited degree in anydirection from the vertical.

2. In a device of the character described, a tool post having a slottherein adapted to receive a tool holder and a rocker, a tool postsupport having an inverted T-slot therein, a base on the tool postadapted to enter the inverted T-slot, the base of the post being adaptedto permit the post to lean a limited distance from the perpendicular; aplurality of discs adapted to encircle the post and to extendapproximately from the tool post support to the rocker, one of saiddiscs having a hub thereon with a hole through the hub describing twofrustrums of a cone joined at the smaller diameter, the hole beingadapted for the post to pass therethrough, the hole adapted for the postto lean in any direction at a, limited angle from the perpendicular, thedisc adjacent to the tool post support being adapted to slide on saidsupport, one of the discs being wedge shaped in thickness, and beingadapted to be rotated independently of the other discs, and adapted whenrevolved to locate a position where it will fill the space between thetool post support and the rocker, screw means adapted to clamp the toolholder, the rocker, and the discs to the tool post support.

3. In a device of the character described, a tool post having a slottherein adapted to receive a tool holder and a rocker, a tool postsupport the upper having an inverted T-slot therein, the base of thepost being adapted to permit the post to lean in a limited degree fromthe perpendicular, a plurality of discs having holes through the centersthereof adapted to surround the tool post and to rest, one on the top ofanother between the rocker and the tool post support, a plurality of thediscs being wedge shaped as to thickness, each disc being adapted torotate on its axis independently of the other discs, a plurality of thediscs having involute threads on the faces of the discs adapted when thethreaded faces are adjacent to each other for the crests of the threadsin one disc to be within the valley of the thread of the adjacentcooperating disc, and adapted when one of the discs is rotatedindependently of the other disc for the threads of one disc to ride onthe sloping surface of the threads on the adjacent disc, and adapted toforce the cooperating discs apart.

l. In a device of the character described, a tool post having a slottherein adapted to receive a tool holder and a rocker, a tool postsupport having an inverted T-slot therein, the base of the post beingadapted to permit the post to lean to a limited degree from theperpendicular, a plurality of discs having holes through the centersthereof adapted to be threaded on to the tool post and to rest, one onthe top of another between the tool post support and the rocker, eachdisc being adapted to rotate on the post as an axis independently of theother discs, a plurality of the discs having involute threads on thefaces of the discs, said threads being adapted when the threaded facesof two discs, adjacent to each other for the crest of the thread in onedisc to be within the valley of the thread on the adjacent disc, andadapted when one disc having a thread thereon is rotated independentlyof the cooperating disc, for the thread of one disc to ride on thesloping surface of the thread on the adjacent disc, and adapted to forcethe cooperating discs apart.

ROY L. DORN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Jan. 24, 1933

